Clara HD Japanese and Chinese characters

I have a number of Chinese and Japanese translated novels which often have footnotes etc which have Chinese and Japanese character in them ie explanation of translation etc. However they don't display at all in the book at all, despite being able to see them when checking the epub in calibre.

I'm assuming the issue is that the kobo doesn't have a font to display them in. Is there a way for me to add one? Or the the issue possibly something else?